Expanding tool.



1510.735413. PATENTBD AUG.4.1903. o. 0. SGHELLENBAGH.

EXPANDING TOOL.

PPLIUATION FILED, mw 1e. 1902.

" No MODEL.

` Witnesses Inventor No. 75,413. t

UNITED STATES CHARLES O. `SCI-IllLLlilNBACH,

Y e atented August 4,19. PATENT Unsinn.

OF NEWPORT, KENTUCKY.

EXPANDING TOOL.

SPECIFICATION forming part of Lettersl ZPatej-.it` No, 735,413, dated August 4, 1903,

Application iiled July 16, 1902.` Serial No. 115,748. (No model.) A,

To a/ZZ whom it may concern:

Be it known that I, CHARLES O. Sottana, ENBACH, a citizen of the United States, resid` ing at Newport, Campbell county, Kentucky, have invented certain new and useful 1mprovements in Expanding Tools, of which the following is a specification. t

This invenlion,pertaining to improvements in expanding tools, will be readily understood from the following description, taken in connection with lthe accompanying draw-` ings, in which- Figure 1 is a' perspective view of a reamer embodying my invention; Fig.f2,' aperspecr 5 tive view of one of the blades; Fig.` 3, a side elevation, part longitudinal section, fof the reamer; Fig. 4, au elevation of the inner face of the adjusting-nut; Fig. 5, a transverse section, on an enlargedscalc, of a portionof the body of the reainer; and Fig.` 6, a longitudinal section of a portion of the reamer, showing a modified form of coupling between the blades andthe adjusting-nut. l

Inthe drawings, ignoring Fig. 6 entirely for the present, 1 indicates the cylindrical body of the reamer, the same having a diam 'eter somewhat less than that of the hole with goilof the body; 3, a cylindrical portion between wardly-presenting ledge extendinglongitudi the main body portion' and the threaded re- `duction,-this intermediate portion having a diameter less than that of the main body and greater l,than that of the threaded portion; 4t, a circumferential series of longitudinal `grooves in the body,the depth of these grooves increasing toward lthe point of the reamer and their depth at their heel ends extending `to about the top of the thread of the threaded portion of the body, thecross-section of these grooves being preferably rectangular; 5, blades seated in the grooves of the body and capable of longitudinal motion therein, the inner edges of these blades seating on the iioors of the grooves in the body; 6, an up- :nally along oneA face of each blade near its base, this ledge being produced in the illustrated construction by longitudinally grooving the face of the blade, the lower shore of -this groove forming the ledge in question;

7, screws threaded into the body, "one alongside and near each blade, the axes of these screws being at such angle to the radii of "the body that the inner ends of the screws will project into/the groovesof the body and overthe ledges on the blades and prevent the outwardinovement of the blades; 8, a

cushion shown as interposed between the inner end of one of the screws and the bladeledge with which it coperates, the cushion being illustrated as having the form of a, disk slotted at its side, so as to form a spring; 9, an outwardly-projecting hook formed at the heel end-of each blade; 10, an adjusting-nut screwing upon the threaded portion of the body; 11, a counterbore at the inner face of this nut adapted to fit upon the intermediate body. portion 3; 12, a circumferentialenlargel ,ment at the root of the connterbore inthe adthe grooving of the counterborc, this iiange ,t

engaging freely between the hooks and the heel ends of the blades; 14, a notch cut through the ange 13 and having a Width equal to that of the hooks of the blades, and l5 a lock-nut screwing upon the threaded portion of the body against the heelward face of the adjusting-nut.

This-reamer may be expanded by the Inanipulationof the adjusting-nut alonel after the lock-nut has beenreleased the retreating adjustment of the adjusting-nut drawing the blades up the inclines ofthe grooves in which they are seated, and thus expanding the vreamer. The set-screws need not clamp the blades, but may take simply a fair bearing on the ledges. If these ledgesare accurately produced, so that they will be parallel with the under surfaces of the blades, then the ends of the screws need no further provision; but if there is a lack of parallelism at the ledges, due to the hardening of the blades, then it may be desirable to provide `compen- "sation at the points of the set-screws, which may be done by introducing a more or less yielding cushion between the ledges and the points of the screws. Such yielding cushion may well take the form of a spring, and the slotted disk illustrated furnishes a substanroo tial and economical form of spring for the purpose.

In assembling the parts the adj usting-n ut is put in place and its notch brought opposite a groove, whereupon a blade may be placed in the groove and pushed endwise to bring its'hook into proper engagement with the adjusting-nut, the set-screw then being set inwardly to prevent outward displacement of the blade,and so on successively with each blade. It might be thought that in turning back the ad justing-nut to expand the reamer the hooks would tend to pull out of the notch as the notch successively passed the hooks, but practice shows such not to be the case, for the notch has the same Width as the hook. By bringing the notch opposite a hook the blade can be Withdrawn from the adjusting-nut, but it will not withdraw itself therefrom; but the nut may be turned onward in either direction Without causing the notch to catch upon the hook. The bladesl may be removed by slacking back the setscrews and then withdrawing the blades endwise one by one as the notch is brought opposite them. The adjusting-nut may be removed Without removing the blades by adjusting the nut heelward to near the extreme position and then shifting the blades end- Wise one by one as the notch is brought opposite them, the nut being later entirely removed, the blades remaining in the body and retained therein by the set-screws. The notch is not essential, though it is very convenient. By relieving the hooks, as indicated in Fig. 6, the blades may be removed by a hinge-like motion after the set-screws are retracted.

The tting of the flange of the counterbore upon the intermediate cylindrical portion between the main body and the threaded portion prevents access of cuttings to the interior ofthe adjusting-nut. The hooks and the hook-engaging features of the adj ustingnut had best be so dimensioned that the thrust of the nut upon the heel ends of the blades Will be at the heel extremities of the hooks, as this will permit of the desired tting of these parts being effected by convenient grinding ,realite at the heel ends of the hooks, a plan of con struction much preferable to that of tting the flange of the nut into the notch of the hook.

Attention is particularly called to the facts, irst, that the blades are tapering blades; second, that their inner edges rest directlyupon the iloors ot' their receiving-grooves; third, that the diameter of the tool is adjusted by longitudinally shifting these wedge-Shaped blades; fourth,vthat the nut which adjusts these blades is a traveling nut; fifth, that this nut has direct engagement-With the blades; sixth, that the turning of this nut is the only manipulation necessary to the adjustment of the blades, and, seventh, that while the screws 7 may, if desired, be employed as clampingscrews for theblades they need not so act and will generally be employed merely as retaining-screws to keep the blades in the body of the tool, While permitting their free longitudinal adjustment.

I claim as my inventionl. The combination of the body having inclined longitudinal grooves and a threaded portion, an inwardly-Hanged counterbored nut upon said threaded portion, longitudinally and radially adjustable blades mounted in said grooves, hooks upon the blades engaging said counterbored nut and a cylindrical portion upon the body in juxtaposition to the hooks and engaging the flange of the nut.

2. In an expanding tool, the combination, substantially as set forth, of a body provided with longitudinal grooves with focally-converging floors, a threaded portion at one end of the body, an adjusting-nut upon said threaded portion and having a notched in- Wardly-projecting flange, blades seated in the grooves of the body, hooks upon the ends of the blades engaging the flange of the adjusting-nut, and means for retaining the blades within the grooves.

CHARLES O. SCHELLENBACH.

Witnesses:

J. W. SEE, E. R. SHIPLEY. 

